Heystack MCP server

Heystack plugins

Plugins for Heystack — observability + security for AI apps — so your coding agent can set up Heystack, investigate incidents, and manage your workspace from your editor.

Install (Claude Code)

/plugin marketplace add heystack-hq/heystack-plugins
/plugin install heystack@heystack

Then run /mcp to sign in with Heystack and pick your organization. Try: "list my Heystack apps", "why is /checkout failing since the last deploy?", or "set up Heystack in this project and verify it's receiving data".

What you get

heystack (recommended) — the all-in-one plugin:

• Hosted MCP server at https://mcp.heystack.dev/mcp (connected with ?toolsets=core,manage): app health, search traces & logs in plain English, open and explain traces, session stories and replays, issues and crashes with the suspect release, gen-AI usage & cost, a one-call incident dossier (heystack_investigate); plus apps, ingest keys, sampling/replay config, alert rules and app care. Team administration (members, invites, access tokens, audit) and read-only SQL stay opt-in: edit the plugin's .mcp.json URL to ?toolsets=core,manage,team (or advanced). Actions that grant access, mint keys or tokens, or send data to an external URL always ask for your confirmation. Sign in with Heystack (OAuth) — no keys to paste. Full reference: https://heystack.dev/docs/mcp
• heystack-setup skill — detects the runtime (Next.js, Cloudflare Workers/Agents, Node, browser, Android) and wires the correct @heystack/otel entry or OTLP path; with the MCP server it creates the app and key itself and verifies data arrives with heystack_verify_setup.
• heystack-investigate skill — the investigation loop: overview → dossier → traces/sessions → fix in code → verify; when to change issue status or create alerts; never destructive without your confirmation.

heystack-setup — the setup skill on its own (no MCP server), kept for existing installs: /plugin install heystack-setup@heystack.

heystack-timeline (optional, requires heystack) — /plugin install heystack-timeline@heystack. Hooks that show your coding agent's steps on the Heystack investigation timeline.

• Opt-in: nothing is recorded until you switch on Show my coding-agent steps in the Heystack console (Settings, Profile). Turning it off deletes the recorded steps.
• Privacy: only the file path of an edit and the one-line description of a shell command are sent. Never file contents, diffs, command lines, prompts or tool output. Absolute paths transit TLS to Heystack and are reduced to repo-relative paths before storage; paths outside the project are dropped.
• Best-effort: Claude Code gives session-end hooks about 1.5 seconds, so the closing call may not land; the investigation then just goes idle. A shell command without a description records no step.
• Requires write access on your Heystack connection; it reuses the heystack plugin's MCP sign-in.

Other agents

• Cursor / VS Code / Codex / Gemini CLI / Claude.ai connect to the same MCP URL — see https://heystack.dev/docs/mcp for one-click links and commands.
• The skills are plain Agent Skills files and are also served raw at https://heystack.dev/heystack-setup.md and https://heystack.dev/heystack-investigate.md. The root plugin.json / mcp.json / skills/ follow the cross-vendor Agent Plugins layout.
• Every docs page is available as Markdown: https://heystack.dev/llms.txt

Layout

.claude-plugin/marketplace.json           # Claude Code marketplace (plugins: heystack, heystack-setup, heystack-timeline)
plugins/heystack/                         # all-in-one: .mcp.json + skills/
plugins/heystack-setup/                   # skill-only (legacy)
plugins/heystack-timeline/                # optional hooks: edit paths + command purposes
plugin.json · mcp.json · skills/          # Agent Plugins (cross-vendor) layout of the `heystack` plugin

Source of truth for the skills is the heystack monorepo (packages/setup-skill, packages/investigate-skill); this repo is a mirror.